Have you ever noticed the kind of dualism that a city generates in your own mind? There's forward and backward, as evidenced by all the two-way streets. Or if a street is one way, there's another one nearby going the opposite direction. There is a grid to be found in the way streets meet in blocks--right and left, right and left. Then there are the boundaries between luxury and poverty, which are accentuated by geographic proximity. And it's only when you get out of the city to confusing tangles of winding one-lane roads and patches of houses followed by forest and the occasional mall that you lose your bearings. The city defines your reality and you're not able to cope with too much unevenness, too much ambiguity.